I saw a post online where someone else had quoted "service commitment date" directly from their notes but I definitely haven't seen/heard anything from CIC that would confirm it, and the word "client" is completely a guess on my part.
I quote the following note from
a post on another forum where someone was sharing their CAIPS notes (which I realise are very different in format):
"Please note no info on back of photos and additional family information from section 'B' not signed. Therefore, service commitment date not entered. CPCM/AO. Case referred to Paris. User ID: XXXXXXXX"
It's a rather similar remark to the one added to my GCMS notes so I felt it probably refers to the same thing (CAIPS "service commitment date" vs GCMS "CSC date")